Per KTLA, the entire LAPD was put on citywide alert and hundreds of officers were deployed to the campus and surrounding neighborhoods.

An official UCLA Twitter account, as well as the student newspaper, relayed orders to shelter in a "safe and secure" place and "deny entry" to intruders while authorities investigated the incident.

"After I entered my department building, I received an alert," Wanmeng Li, a graduate student in the department of Asian languages and cultures who was locked down in Royce Hall, told Mic via phone. "The alert said all the buildings were locked down. There were rumors that there were more than three shooters."

"It was frightening," she added. "It's the first time for me to experience this."

Stay in your rooms or a safe location. Do not try to go to classes or dining halls. Wait until it is safe to leave your location

Shooting reported at Engineering IV at #UCLA. Go to a secure location and deny entry.

"I was in a classroom in a main building (Royce Hall) at 10 a.m. when news came over the UCLA text and email alert system," Jonathan Banfill, a teaching assistant and doctoral student at the university, saidin a separate phone interview. "As more news came in over the next 20 minutes, we locked down the room and have been waiting for the past two hours."

"We can hear helicopters outside and sirens, but not much else," Banfill added. "Otherwise following the story via social media and news reports. Campus is quiet now with the majority of people inside buildings. We heard that police are slowly clearing buildings floor by floor, but haven't reached our part of campus yet."

A UCLA staff member who was not authorized to give his name to the press told Mic over the phone, "We brought students into our office that were nearby in the lobby and outside, and have been in place since. The staff here is on high alert, but we're calm."

Heavily armed LAPD and FBI tactical teams were still clearing the building as of 2 p.m. EST.

UCLA students hide in classrooms as shooting leaves two dead http://4.nbcla.com/Iejh7B2 pic.twitter.com/boIB3LcPAR

"WATCH: Heavily armed law enforcement going into @UCLA building "as fast as they can" https://t.co/AwPBNLNj3i"